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https://github.com/mainflux/mainflux.git
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1e017bdbcc
Fix data scheme so that cassandra stores channel and thing id as text. Support sorting by time per channel partition. Signed-off-by: Aleksandar Novakovic <aleksandar.novakovic@mainflux.com>
47 lines
981 B
Go
47 lines
981 B
Go
//
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// Copyright (c) 2018
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// Mainflux
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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package cassandra
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import "github.com/gocql/gocql"
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const table = `CREATE TABLE IF NOT EXISTS messages (
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id uuid,
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channel text,
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publisher text,
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protocol text,
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name text,
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unit text,
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value double,
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string_value text,
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bool_value boolean,
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data_value text,
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value_sum double,
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time double,
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update_time double,
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link text,
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PRIMARY KEY (channel, time, id)
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) WITH CLUSTERING ORDER BY (time DESC)`
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// Connect establishes connection to the Cassandra cluster.
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func Connect(hosts []string, keyspace string) (*gocql.Session, error) {
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cluster := gocql.NewCluster(hosts...)
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cluster.Keyspace = keyspace
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cluster.Consistency = gocql.Quorum
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session, err := cluster.CreateSession()
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if err != nil {
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return nil, err
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}
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if err := session.Query(table).Exec(); err != nil {
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return nil, err
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}
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return session, nil
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}
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